I bought my e46 328ci a few years ago and it came with KWs. I'm not sure what version. The shocks are purple non-adjustable... if that helps. In the past year I've been getting into AutoX and HPDE, so I'm focusing more on performance. I have absolutely no problem spending $400, or even more, for new spring, rather than having to shell-out the $3k for AST4200s. My question is regarding the performance of the shocks in my KW system. Lets say I upgraded to Swift, or other top-brand, springs. Maybe I went as far as to have my current shocks revalved for the new spring rate. Would I have a competitive system or would the KW shocks still be holding me back?